This set of changes adds recaptcha support to bridgedb.
The implementation proxies responses from clients to
preserve their privacy.

This set of changes allows bridgedb to filter responses
by country; if a bridge is known to be blocked in a country
it can be filtered from the set of returned bridges.

With this patch we dump the list of currently running bridges with
information about their assigned rings, subrings, and file buckets to a
local file.  The idea is to publish sanitized versions of these assignment
files and analyze how the assignment affects a bridge's usage.

The assignment file is written on startup and after receiving a HUP signal
and parsing new bridge descriptors.  Note that the assignments file is not
updated when bridges are dumped to file buckets; in that case the changed
assignments to file buckets will be reflected in the assignments file
after the next HUP.

Also note that the assignment file only contains bridges that are believed
to be running from parsing the last network status.  As a result, bridges
that are contained in file buckets, but that are not believed to be
running, won't be contained in the assignment file.

- Install translations to ~/ by default instead of /usr
- Use ~ as prefix by default
- Make sure pseudo distributors don't end up as actual ring names

Also, let users request languages by URL via /?lang=foo *and* /foo (Thanks, arma)

when asked.

according to the review comments by Nick.

svn:r20332

svn:r15143

Implement code to force handing out a minimum number of ORs with a given ORPort from a given ring, if possible (will not give good results until the number of such bridges is over the number of rings).  Also, initial support for IP categories, usable for proxy selection.

svn:r15137

 Implement bridgedb feature to take IPs from X-Forwarded-For headers


svn:r13491

svn:r13116

svn:r13071

 Make from addresses in emails configurable.


svn:r13064

 Revise todo; add (configurable) code to check for DKIM headers


svn:r13063

svn:r13044

 Make the "ignore . characters in email addresses" logic configurable and domain-specific.


svn:r12997

svn:r12895

svn:r12894

 Add python logging support, better message templates, and support for partially empty rings.


svn:r12849

svn:r12828

svn:r12827

 Implement pid-file support.


svn:r12818

svn:r12815

 Fix bugs to the point where everything in bridgedb works; check in an initial configuration file.


svn:r12812